bt848kpf ETC-unknow, bt848kpf Datasheet - Page 14

• Manufacturer Part Number: bt848kpf
• Description: Single-chip Video Capture For Pci
• Manufacturer: ETC-unknow

F
Functional Overview
Figure 2. Bt848 Video Decoder and Scaler Block Diagram
4
UNCTIONAL
Notes: (1). Bt848 only.
CLEVEL
CREF+
CREF–
YREF+
YREF–
CIN
YIN
PCI Bus Interface
(2). Bt848A and Bt849A only.
D
ESCRIPTION
Bt848/848A/849A is designed to efficiently utilize the available 132 MB/s PCI
bus. The 32-bit DWORDs are output on the PCI bus with the appropriate image
data under the control of the DMA channels. The video stream consumes bus
bandwidth with average data rates varying from 44 MB/s for full size 768x576
PAL RGB32, to 4.6 MB/s for NTSC CIF 320 x 240 RGB16, to 0.14 MB/s for
NTSC ICON 80 x 60 8-bit mode.
MB/s. Achieving high performance throughput on PCI may be a problem with
slow targets and long bus access latencies. The Bt848/848A/849A provides the
means for handling the bandwidth bottlenecks that sometimes occur depending on
a particular system configuration. Bt848/848A/849A’s ability to gracefully de-
grade and to recover from FIFO overruns to the nearest pixel in real-time is the best
possible solution to these system bottlenecks.
The pixel instruction stream for the DMA channels consumes a minimum of 0.1
L848A_A
Single-Chip Video Capture for PCI
Clocking
Bt848/848A/849A
Brooktree
®